1887

Abstract

An arsenic- and radiation-resistant bacterium, strain Wt/1a, was isolated from water from an arsenic-contaminated aquifer located in the Chakdah district of West Bengal, India. The bacterium stains Gram-negative and is rod-shaped, non-motile, non-sporulating and red-pigmented. Cell-wall peptidoglycan contains ornithine as the diamino acid, MK-8 is the major menaquinone, C and C are the major fatty acids and the DNA G+C content of the organism is 65·8 mol%. Based on these phenotypic and chemotaxonomic characteristics, strain Wt/1a was identified as a member of the genus . Strain Wt/1a exhibited maximum 16S rRNA gene sequence similarity (95 %) with ; however, strain Wt/1a exhibited only 14 % similarity to IAM 13005 at the DNA–DNA level. Furthermore, strain Wt/1a (compared to IAM 13005) is more resistant to arsenate and arsenite, is positive for arginine dihydrolase, utilizes a number of carbon sources and exhibits quantitative differences in fatty acid composition and qualitative differences in lipid composition. Strain Wt/1a is identified as a novel species of the genus , for which the name sp. nov. is proposed. The type strain of is Wt/1a (=MTCC 4913=DSM 15307).

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2004-03-01
2021-03-03
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